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草地土壤有机质不同组分氮库对长期氮添加的响应
武运涛1,2, 杨森1,2, 王欣1, 黄俊胜1, 王斌1,2, 刘卫星1, 刘玲莉1,2,*()
Responses of soil nitrogen in different soil organic matter fractions to long-term nitrogen addition in a semi-arid grassland
WU Yun-Tao1,2, YANG Sen1,2, WANG Xin1, HUANG Jun-Sheng1, WANG Bin1,2, LIU Wei-Xing1, LIU Ling-Li1,2,*()

图4. 氮添加对土壤中颗粒态有机质(POM)和矿质结合态有机质(MAOM)的相对含量(A)、碳含量(B)和氮含量(C)的影响(平均值±标准误)。F和p为方差分析的结果, 不同字母表示不同氮添加水平间存在显著差异(p < 0.05)。

Fig. 4. Effect of nitrogen (N) addition on the relative mass (A), carbon (C) content (B) and N content (C) of particulate organic matter (POM) and mineral associated organic matter (MAOM)(mean ± SE). F and p are the results of one-way ANOVA. Different lowercase letters indicate significant difference (p < 0.05) among different N addition levels.